chore: store anonymous ids in userID hll to optimise storage

[mihir20]

Description

store anonymous ids in userID hll to optimise storage and memory

Linear Ticket

https://linear.app/rudderstack/issue/PIPE-1384/add-anonymous-ids-in-userid-column

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.41%. Comparing base (77b75fb) to head (52b3fdb).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4988      +/-   ##
==========================================
+ Coverage   74.37%   74.41%   +0.04%     
==========================================
  Files         428      428              
  Lines       49909    49915       +6     
==========================================
+ Hits        37119    37146      +27     
+ Misses      10340    10328      -12     
+ Partials     2450     2441       -9     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[satishrudderstack]

We should probably rename these columns to trackedIdentifiers and mergedIdentifiers at a later stage

[satishrudderstack]

I think we can have one realistic case in the integration tests. Like we generate few 100s - 1000s of events with userIds and anonymous ids and validate

[mihir20]

I think we can have one realistic case in the integration tests. Like we generate few 100s - 1000s of events with userIds and anonymous ids and validate

We actually are generating events close to 100 in our integration test